There are two issues here.
1: Adhoc not working anymore. We can discuss that one here. Can you revert pilight each nightly version step by step and tell which is the last one working.
2: Can you open a new topic for debugging the:

I tried every nightly and reinstalled each version.
Right now the last version I got to work is 8.1.4-25-g6bc8511a
Latest nightly 8.1.4-31-gef298946 is unable to start but for this I started a new thread as you suggested.

This is a bit crazy as 8.1.4-25-g6bc8511a didn't work at my last test.
Anyway it seems to be the last working version.

One question:
My config settings are standalone: 1 and port: 5000
With this I should manually start the daemon in debug mode with the following command, right?

Code:

sudo pilight-daemon -S 127.0.0.1 -P 5000 -D

But with this command I get the "lost connection, trying to reconnect" messages.
I can only successfully start with